Presentation on theme: "Reflections on Moonsighting"— Presentation transcript:
1Reflections on Moonsighting With the Name of Allah, All-Merciful, Most MercifulReflections on MoonsightingDr. Usama Hasan(Al-Tawhid Mosque & Royal Observatory Greenwich)presented at:The Mu’adh Centre, Birminghamto the Nigerian Muslim Federation6th Jumada al-Ula 1430 / 2nd May 2009
2Synopsis Ayat, Signs … Surah Names The Sun The Moon & Crescent-Sighting issuesStars & Simulations
3Ayat, Signs … “We have made the sky a protected ceiling; But they are, about its Signs, unmindful.”“And amongst His Signs are the night and the day,The sun and the moon …”
4Chapters of the Qur’an Al-Shams (The Sun) Al-Qamar (The Moon) Al-Najm (The Star)Al-Buruj (The Constellations or Zodiacal Signs)Al-Tariq (The Piercing Star)Al-Fajr (Dawn)Al-Layl (Night)Al-Duha (The Forenoon)Al-’Asr (The Late Afternoon)Al-Falaq (Daybreak)
6Annual Motion of the Sun, Moon, Planets & Stars “Lord of the Two Easts, Lord of the Two Wests!So which of the favours of your Lord will you deny?”(al-Rahman 55:17-18)“Lord of the East(s) and West(s) …”(Muzzammil 73:9, Ma’arij 70:40)
7Annual Motion of the Sun, Moon, Planets & Stars (Q. 55:17) SUMMER SOLSTICEEQUINOXESWINTER SOLSTICENENSWEasts (Multiple, Two limits)Wests(Multiple, Two limits)
8The Moon - Basic FactsThe Earth travels around the Sun once every 365 days (& 6 hours)The Moon travels around the Earth once every 29 ½ daysA lunar year of 12 lunar months has 354 daysPhases of the moon result from parts of the Moon reflecting the Sun’s light towards the EarthA lunar month has either 29 or 30 days (hadith)
10Looking for the New Crescent Only visible after sunsetMust wait for the sun’s glare to die downExperience shows that the best time to see the crescent is about 20 minutes after sunset (when the sun is 5° below horizon)Perfect timing if the Sunnah is followed (Salat al-Maghrib should be fairly short)Look at the western horizon, near where the sun set
11A Good Test of Moonsighting “When the crescent moon is visible somewhere on earth, it must be visible at all points west of it [on the same latitude] with a clear horizon.”This simple principle is also agreed by the scholars of Islamic Law, e.g. the Shafi’is, Ibn Taymiyyah, etc.
13Moonsighting - History The Islamic calendar is a purely lunar oneIslam abolished the Pre-Islamic Arabian method of intercalationUntil relatively recently, the start of each lunar month was determined purely by observation of the new crescent moonIf cloudy, use a simple alternating 29/30 day ruleCommunication constraints meant there was no controversy across the vast Muslim lands
14Moonsighting – Islamic Law (1) The Shari’ah (Sacred Law) covers all areas of lifeBasic rule: crescent-sighting establishes the new monthCalculations: controversial; different viewsCannot be used to determine new monthCan be used to reject false crescent-sightingsCan be used to determine new month
15Moonsighting – Islamic Law (2) Applicability of a valid crescent-sightingOne view: ikhtilaf al-matali’ (“multiple horizons”)Crescent-sighting applies only “locally”Nowadays: each state has its own horizonAnother view: ittihad al-matali’ (“unified horizons”)A single sighting applies for the whole (Muslim) world
16Views of Ibn Taymiyyah (8th/14th C) Hilal-sighting depends on how easterly or westerly the location is, so if the hilal is seen in the east, it must be seen in the west, but not vice-versa. This is because sunset occurs later as we move further west. If the hilal has been seen in a particular location, its illumination and distance from the sun and its rays will increase at sunset to the west, and will therefore be more easily visible. The reverse case does not apply, i.e. if the hilal is seen in the westerly location, since a factor in its visibility may have been the later sunset there, such that the hilal’s distance from the sun and illumination will have increased, whereas it was closer to the sun in the easterly location.
17Views of Ibn Taymiyyah - 2 The fixed rule (dabit) here is that this matter depends upon information, due to his saying, “Fast upon its sighting.” Therefore, whoever is informed that the hilal has been sighted, Ramadan has conclusively begun for him, with no consideration at all given to distance (i.e. no matter how near or far he is from the place of sighting). This corresponds to Ibn ‘Abdul Barr’s statement that there is no effect of news reaching built-up areas after the month is over, unlike places where news arrives during the month, where it may have an impact.
18Views of Ibn Taymiyyah - 3 He made the hilals markers of time for the people: they cannot be so unless they are observed via sight and the news transmitted via hearing. If there is no observation, there is no marking of time, so they are not hilals. This is the most that can be established via the senses, since to specify the location where the hilal first appears by way of calculation is not correct in the least, and I have written something about that. [NO LONGER TRUE]This matter depends on the latter also, for it is not within human capability to determine specific times and locations for seeing the hilal. [NO LONGER TRUE] People can only be sure about what they see with their eyes or hear with their ears. Since the obligation upon the person who sees the hilal is to follow his sighting, and upon the person who does not see it is to follow the news that he hears, someone who neither sees nor hears anything has not achieved ihlal.Majmu’ Fatawa Ibn Taymiyyah, vol. 25, pp
19Background - Calculations Accurate calculations for the position of the moon have been around for thousands of yearsE.g. solar and lunar eclipsesHowever, calculation of the visibility of the new crescent moon has only become significantly accurate over the last ~20 yearsYallop, Ilyas, etc.Usually, the moon needs to be hours old before the crescent is visibleUsing conjunction (“astronomical birth”) means the month will start one day too early
20Calculating Crescent Visibility Simple prediction rules have existed for millenia (ancient Babylon, Greece, classical Islam, e.g. al-Bayruni, etc.)Modern criteria have been developed by:Bernard Yallop (ex-director of the Royal Observatory Greenwich)Mohammad Ilyas (Malaysia)Schaefer (kept the details secret)Odeh (Jordanian Astronomical Society)
21Calculating Crescent Visibility (2) Moonsighting.com is based on Yallop/Ilyas and uses five factors only:The angle between Sun and MoonThe (angular) height of the Moon above the horizonEarth-Moon distanceEarth-Sun distanceA measure of pollution in the atmosphereMoonsighting.com’s predictions have proved accurate every month since 1994!
25Combining Shari’ah & Science Accept local sightings, as well as those from the East of your location, but not West. (Simple physics)Instantaneous telecommunications must be taken into account. (Ibn Taymiyyah: the matter depends on information)Calculations are now precise enough to decide Islamic lunar months, unlike in the time of mediaeval, classical scholars
26Towards a Unified Lunar Calendar With accurate calculations of crescent-visibility, a worldwide lunar calendar is now possibleThere are 3 major possibilities:Use the visibility curve as an ILDLFix everything wrt one place, e.g. MeccaCompromise: the Unified Hejra Calendar (divide the world into three time zones)
27Proposal 1: Crescent-Visibility curve as ILDL (International Lunar Date-Line) 30 Shawwal 14261 Dhul Qa’dah 1426
28Proposal 2: Fix everything wrt one place, e.g. Makkah 30 Shawwal 1426Makkah1 Dhul Qa’dah 1426
29Proposal 3: the Unified Hejra Calendar (www.icoproject.org) Western RegionCentral RegionEastern Region
30Proposal 3: the Unified Hejra Calendar (www.icoproject.org) Western RegionCentral RegionEastern RegionFor Dhul Qa’dah 1426, ILDL coincides with the Solar dateline
31The MOONWATCH ProjectLaunched 1st Oct & will run for several years (www.crescentmoonwatch.org)A mass-experiment for the UK publicPart of Einstein Year (2005 is 100 years since the publication of Relativity theory)Everyone is encouraged to look for the new crescent every month and report their observations via the above websiteWill help improve HM Nautical Almanac Office’s crescent-visibility calculations, in sha’ Allah
32The MOONWATCH ProjectSince October 2005 (Ramadan 1426), about 3000 observations of the hilal, both positive and negative, have been reported to the Moonwatch website from around the worldALL the results are, so far, consistent with the current Greenwich model for predicting the visibility of the hilal